Hi NoWater.
Thank you for bringing this to our attention. I appreciate your taking the time to raise this inquiry regarding the 28 cu. ft. Large Capacity 3-Door French Door Refrigerator.
The water line kit is only needed to filter the water for your ice maker. Since you've already mentioned that you are planning on leaving the ice maker in the off position, a water line is not required.
In case you'll use the ice maker in the future, here is the user's manual for the installation guide on page 19.
https://downloadcenter.samsung.com/content/UM/202007/20200728002937594/DA68-04012L-00_FDR_RF6000T_ND__EN-MES-CFR__USA.pdf
https://www.samsung.com/us/support/service/warranty/RF28T5001SR/AA
One (1) year parts and labor
Five (5) years parts and labor on Sealed Refrigeration System Only (Compressor, Evaporator, Condenser, Drier, and Connecting Tubing)
Ten (10) years part and Five (5) years labor on Digital Inverter Compressor Only
Should you need more assistance, please feel free to get back to us via the following options:
1. Facebook Messenger: http://m.me/Samsungsupport
2. Twitter: https://twitter.com/messages/compose?recipient_id=18768513
3. Samsung Community: https://us.community.Samsung.com/t5/Samsung-Community/ct-p/us
Reference Number: 1144628035
Have a great day.
^Charles